Discrete dislocation plasticity analysis of single crystalline thin beam under combined cyclic tension and bending

Discrete dislocation plasticity analysis of single crystalline thin beam under combined cyclic tension and bending
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单晶薄梁在拉弯联合作用下的离散位错塑性分析

DOI:
10.1016/j.actamat.2007.11.032
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发表时间:
2008-04
期刊:
影响因子:
9.4
通讯作者:
Huang, Minsheng
Huang, Minsheng
中科院分区:
材料科学1区
文献类型:
--
作者:
Ouyang, Chaojun;Hou, Chuantao;Li, Zhenhuan;Huang, Minsheng

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本文用二维离散位错塑性理论分析了单晶薄梁在循环拉弯载荷作用下的循环塑性响应。在这方面的贡献,特别注意的是不同的循环荷载的尺寸效应的内在机制的差异。结果表明,无论是纯拉压循环还是纯弯曲循环,材料的循环塑性响应都具有很强的尺寸效应。然而,内在机制是不同的。位错饥饿机制在循环拉压过程中占主导地位,而几何必需位错机制在循环纯弯曲过程中占主导地位。在拉弯复合循环荷载作用下,梁的弯矩-转角响应表现出较强的尺寸效应,而应力-应变响应表现出较弱的尺寸效应,甚至没有尺寸效应。此外,还发现循环加载路径对循环应力-应变环的形状有很大的影响。
The cyclic plastic response of a single crystalline thin beam subject to combined cyclic tension and bending is analyzed using two-dimensional discrete dislocation plasticity. In this contribution, special attention is paid to the difference in the inherent mechanism of the size effect for different cyclic loads. Results show that the cyclic plastic response has a strong size effect for both cyclic pure tension–compression and pure bending. However, the inherent mechanisms are different. The dislocation starvation mechanism dominates the cyclic tension–compression while the geometrically necessary dislocation dominates the cyclic pure bending. When the combined cyclic tension and bending are applied to the thin beam, the cyclic moment–rotation response shows strong size effect while the stress–strain response shows weak or even no size effect. In addition, it is also found that the cyclic loading paths have considerable influences on the shape of the cyclic stress–strain loops.
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